For lab application, especially useful for solution that is corrosive to PC plastic and circumstances where higher temperature is consecutiely measured. Normally used with reductive media. Model 99Pt-A 99Pt-B Measuring Range +/- 1500 mV Junction Ceramic Reference Cell Ag/Agcl, KCL gel Sensitive Component dia.1 x 6mm Platinum needle dia.6 x 2.5mm Platinum ring Size dia.12 x length 160 mm Plug BNC + 1 m cable Note: Difference between the two models is the shape of the sensitive component. A is needle and B is ring.